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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a42d15771b900f0417a56432ece5c47bce7b4fc0c4087ca07e468da555badc3' 
  AND token = '2xD/y3SlwyX/4nLHXWKHkBNs9N1ZXvznWGK5jC2KRvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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