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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dfd08e10b40311894c7f4159cce7e7108d5c8e5e30a32f0d61d7346886e7baa' 
  AND token = 'WqINiLNFmLcVvS8/X+CVfC1PfoRfiAyl5ajLWlcYNvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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