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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd205f0bd5caca22e26b8c65db7f091d47cba6fbda9434d33bbd14a5d442ace56' 
  AND token = 'OKMOtK/PQAmNEKO7ot3rwtZGGcryUDHYWxpDkR4QZRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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