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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3d8fe66b0bd4ece9892543960b0db822167a55c04213c1b5cfc8c3dbf340b79' 
  AND token = 'u8nLjJFi8kx9RUvOLsIruxRpC/xCyK5Dh8U4hQu7buE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00262

JSON explain

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