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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'beadf490e2ea044ed0c562cb5a2384afc73f3424b5be16f00c78fad7fe28314b' 
  AND token = 'oZTYJmQmwUNM/Yq5vi+V4EaAcKaXirDlcW7ITV06ypo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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