SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f223ab527c92b1a5802bc4f00b80edf9f17370368d365ca4abbef09a2d5a71' 
  AND token = 'pDVZqmIj7PD7Dr7wvYy0fpJLZGD/TNXijG1cgHkWKy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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