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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d5fe7d1fdae622131a7de9c71ee10b93d7801576afc73648d9d957d3633ce26' 
  AND token = 'e7D0xExrshEwXdCEWi4bXhKdrNx4v4nNyAxSDchQ1aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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