SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17f04bab9bb53669a5f93f04524a94271489649fbc82d55e921a5291f95161d5' 
  AND token = 'ET32+LK9OOUMIbIglvDLikUGibuhUzmoe8MBV5rr/HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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