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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '548d7bcbdbfd21fb6a49b1c5138b8bedc2b8cb7d23947b795ba2e85f38dfdbbc' 
  AND token = 'qinScFjEP+0CC6M9RQJEcsBoJXexh+CM7qoQQ0KTS0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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