SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e9ba582724a6315838b05c1fc565823dcdf3a535e24c65f2c545fbd0b993d47' 
  AND token = 'oX/cS6V5KhKfGbtcvHlYVuPqSRwurk0m1wQ7osJn82I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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