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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e410216bdbfbfb563b7d02decd3cb04a49121a677649b23f916b3688d09c777' 
  AND token = 'I3dgyEbjdbKHgtf+qi5NsDXr97xrcDXUV2ObTYcQIag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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