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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69c46ddb9e90e4944885e93cc661393c738b81a8a8fe5f5371588d9056d7a4e8' 
  AND token = 'n76d4dxjjX/erbguFb7vMN/WmzB8lqezaRKb5R+JzrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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