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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52dfceb28ebebee2ffe50104046c57fabfc6a507b4bcb84147a282cf2beac879' 
  AND token = '5VooutFIoZ0cz6z/W8LZDZ3ceYPaV9jj2lzoe0Sr3hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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