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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ccf8603084eb6f8d9a838bf4db927f3cf6e0c233e13e222643bae82026a656f' 
  AND token = 'vadg/ITXAzp8o6guOW0v2Yqbc8+w/8t59k/QPSrpYVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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