SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9fc6f4d774f0c9f14839f15d0b7e1d280751ba2edd6c9f7e9be2fb1c0db1dd' 
  AND token = 'WzQ/Q/ZmjhaNVlhcCP4o+AU6ltulryAQ0NMG8gOFm9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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