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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '458cd6fc47a0379a433b876d3bf419b4a28a889ff9910ae3bf5be1bb7cede0a2' 
  AND token = 'T8DVmykmMnH8BKsSPeODwTl5AmIaU+g2n6KSc69Hjjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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