SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd50335b9275919d8e207352296a130246703b1a83faa60528fd8e47aa94a1b9e' 
  AND token = 'iEm2KkMslHVauYBwjzXzjfDOYycF6btYnBCroSZXwqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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