SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc62ee4f36ca2e4e0a7eaeb3276869879e1a257d78888fb23df7c2b3711a92c4' 
  AND token = 'ah5qFm0q9c5mLWpCpJfF/nzivVZeXris0HM0VJ15h/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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