SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69182194e45c116b0e981b5d7c3f22a8a4b6eb5825962a008f38cd518ba92c4d' 
  AND token = '0VtdhR+PIZnZutVyR/TEAnlUOVYAJjicUt3aFvibwp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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