SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a12806499ad6daf43f8bddd68308e87dde6f3830c61182206b60979b700992e7' 
  AND token = '5LNb8+ZaDpCBjdwaKgAJmhqI3bHcWmVPwEsqHtP9K3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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