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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7433eb52a1e8f6b320cef1c99a0e4795afc06df4c5092496611970f5247adb24' 
  AND token = 'cCTJ7WDbw3ERHxfby3RvSd72ofnswUcLJipYL+fdCPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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