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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cd3c999d69b80f3ea07134b229631d93ba0a7dc899ee4859d23f2e81f7b7b1c' 
  AND token = 'ciGmAI6auV6jJyMsSz6+W5QUIyBAnx0gIR9YaPEbwY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}