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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff4a120343b1509f6f2f4fdf2ea72db458840b369107d755e08404a0ead379cb' 
  AND token = '86byEYqTy5VbzRRuRfvnh1EHttOy/ceGDAZUXQyexB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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