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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9db8a5fbe074d036139699746aee3b0f93e9db591f5b50ee1cf97e2032bb20b0' 
  AND token = 'TTBSGYnen7lNJJ2rGUxG7qwMh8CfE7CutWbbPWUkvfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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