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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4483b7ff5e38958d0a6677c82818b1b55fdc3dab166ae473b34ba99e1abee7e' 
  AND token = 'itWMJRHr9iI299+0gKXqyXBd24rczx1ztF0jDs5S1KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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