SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d633729a49f5581778b60c94e975a39900fb88aada8b6a8fc42f2300a49b56a' 
  AND token = 'hQ5IhnBxRogmTJ2jsfr0QFrblm7ub2L5FDYJPVilFAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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