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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eb371e2d76365903d869eb8a475a40e137f96bfbdac805a147d66334e24c979' 
  AND token = '9HCid8YdbpwLhkPuF5oKFlD4GXQXRApQW0d5Nw340Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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