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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da567d93eb714c92fb4f7f9c24850ad460b4b7b5050a15aca03e4dfdaea8b8d' 
  AND token = 'x4KCdWE8uwIFyooc1YjOS43nmhVepZQK1sFUD5FuKko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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