SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '857d49011e06c184fdd4a3a77a8681df9c716b80dd626229f87c88f72631a92a' 
  AND token = 's+0wYNa4I8FeDoUMJBwLKEZzwZPgvCdw8X5vPO7UNus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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