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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7f5a32d249f8f0c2f1ddffd9510a9c9802fd63d8c771ec38354f4a87cdca23c' 
  AND token = '1qiSunKruuWRgI/TUtfExDnmp9zD44qvGRJ94hNGXJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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