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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa256deeda4124dabe9b4ab9acf2d514c6ea9ff6405fd45722ff1df653e857d' 
  AND token = 'GyAF8GfGO+ofEZfuS1RnxcfLY/P9Xqnuc4/4t+YCJr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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