SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b9da6ae65c1bfbd2aa6edc95b048918b37bf6950d8e75e269976d87f6886229' 
  AND token = 'mFuj1tLghEyPu+/lIzZMKxJL0HRsIicOJaRm5+ROl4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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