SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0c2dd0da36e8387f0dc0a44f7f153b0cfb3e6b83d4d2661d751091d6449a975' 
  AND token = 'PVBg8IwJXmvJt/Rmfl6MFHNL2sYBQUW5qasF3lgians=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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