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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f6d7b0ff9e422196a62423f7e062b98549fa44273d7dc246a8c85fceeaf947a' 
  AND token = 'tyZ5gynJHhFLy8P0VUN9u2GpwiZTj5Sh4eRnbEoaUtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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