SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f07a21d1d9922ddb52908255fdc588a5d91c754e2bb735964f9ea1e1341be33' 
  AND token = 'bqsldSzyAYgO/JLifhV/Ze0daHYqGQfIXtgdCfPn26A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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