SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51e4e42cbdaeb72c72b9f074754a01768f683ac892005a2fd7de437ae4e5c1d8' 
  AND token = 'bKnqhMN87xSrJbIR4O9z7CiXZcKBnXBKlaYbz/QTByg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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