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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52003942d2c23637ce2c3262015c2c7c62cf7f81ca8e829b73b40f67ff4c86e6' 
  AND token = 'V5mqDBdfBua1tDx5CbMrsCfgc6LzNo5hQRPyExFdVwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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