SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7484cf9802e808f97b0b198409786c65b59c365e0e98bbad8c6cc0ad80f34911' 
  AND token = 'GCHBzujwenVuakqdHWtvwQpgGl5kgDcOI7jQf5vTUYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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