SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4da856673ba7c4bbfd17c8e915f7f49455103256d82fa1a9f62439e21d7b4e60' 
  AND token = 'HaVg8BZosSwXkVVX30X1M/A/GTbmT5EqY4MYNcuN6RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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