SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6538fb919eec16c4c5b8aec37095289f59f5f13d90c137a30c7263745e63f334' 
  AND token = 'hkk1WaJcmbBY5PVZMzvsNkcjVy6PdqGTvPH3KbD0Dto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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