SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b79456e98a22d349ec23c7a8b6289ef73cd15b559540e4ac6d8a941cb9601f4f' 
  AND token = 'KgzhsDg2MtudacLSViBu1UKXBJMVYUWLj3fD4BXUSNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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