SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55f29c8bfb5faba1d561e4340ff35f6f55c56a303ab268642e8f9904f96f723c' 
  AND token = 'wh+Pahi4f3De2mKGIFxYoJiRD2AltVk0CKyVKSQFBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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