SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5853fc95384fff0260288f0068befcc653c2c9d70f88f4e19213c0e31d287b4a' 
  AND token = 'UEdGjZr6RzY2hhCg7hflfK57B8v7F1PWa1rNHpJBXUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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