SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93c986ace77f1c8e1c85276e309c5c1962356cb5563c39da63d84363611ea1db' 
  AND token = 'lXysYvUJoVYTrvjPv3XhW5JhMtN+LBRYnn6bqqLuh2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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