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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad44de49c56476f7a8c2feefc1618be1c1f99431e5d656103daf5c3579c32c42' 
  AND token = '9oGldZbUrExptgUeCCJ5DwqrqArjyykrbJcFv4y6DUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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