SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd53fcd184f1c105160aef0d12387b44d76347fd3be58a75722ef9ebd574e55b0' 
  AND token = 'H0dJqomONhL4ghfgEzQxuByYmTYYnU7BYLJ03QRh2Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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