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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7063d058e6a3f64df01a209e863b44d6d46b56499857e4ba3fa5422e537491b7' 
  AND token = '9R81/NnHn90qIREV4x7ESNCKqrEGilHBFb2uZo1udOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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