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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36f52bf59488b701e8d43e348bd89e5218ebad7edca356e00ec425ba3953159f' 
  AND token = 'rRMsnDIraSpBUH6/N5RJJgxUKL4HUay7Tg9uOpO17Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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