SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '887b5977eba90f8ed9e04a4f9497bb349b70492abad106e625d16264f77b1caa' 
  AND token = '57c77uYVBRKKsjAE8GinNJG+FsYwZsYbUOjBgNzVve4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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