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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '470216544fbf270035c7c22dad954fc870bc8b8b7e458b457ec496610be940a4' 
  AND token = 'FoXC5LcHgfdAtLwRWa7XxBvL94aSAnsHd8K2mxsmQxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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