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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc073f4ba79b8dc1f0d0d9cf500b172753a04b0f0e47d5c53a10c33a59281cd' 
  AND token = 'QZrdDlXL1R0ou91fI2BRu4pJ0hlsU2UJgHgnHm19csE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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