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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b98f5d8f097b4d420beaf98022281ff0ea6da669c0805d4a6b8d6d55306211da' 
  AND token = 'ZgoMps54Ucf7G713OXikWo9TRMrtGISjCUNg/wKS/Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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