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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2c742de67e5fc21f4e07228029fc14e83c9962363214f6daadb2bc14d31af14' 
  AND token = 'a8bJwt1356zhkgGr45lYVekTm/hAZxFyR6u6AN1N+yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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