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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '209d8458f1f181bc267df0326ee710104d62eb1c71369386b0d6f65383babd5b' 
  AND token = 'wTiw01ErenW9GIxWLrbXKa96Cx99koNop8bcJLPxJs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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