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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f82251163c86038a8c133ee9e901790387326c4f9dd8300cc441a55b14bb6dfb' 
  AND token = 'czA7QXrU1k/iW0bCz6aP6rFDnqH+Rs1FtNldVohhAlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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