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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5b1bd44178997c95a4d515b712f6a4f36a5a104cb8f55a25da0ad87e8269066' 
  AND token = 'Y18VDQ8Vd7drfLjiFBrbAHq9q+iUbm6he5gDcRCbnvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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