SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '388bc4f2153fdfabfd424d13bc352af5d5d5ac8abff44d7bbbc6a57d35b563d0' 
  AND token = 'qNzQzk+QErH3K3BObuZTFyRIU2H91oij9YoVZ1BKws0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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