SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7ee7c596edaf0a345ffc87906acf4047a8de556b7cd86edf12c553ce152c8e5' 
  AND token = 'jrrsxzl6nCVtJdH2GZnVCC/JoQ/EIhLUc675QVPXwg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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