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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c5e65e94f0467a864f847a2592e8658b549389ed6b46bcb2145acdc7a652479' 
  AND token = 'P3Tj7M7mY/RKAw3s2WbacXxbX9rNuKjV/0yOuyCF52o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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