SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd513d53914682cf801e4702cb68ec6293424c6e3829ef512751a149f2528f720' 
  AND token = '0o9sUjcMXgw8EHFsn6qoICJQlIlBgg2BHskuhI+yupc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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