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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfc54f808db12fc89becd056ceb3160dc7dae59babaf2fc675a1d5c7e1f288a8' 
  AND token = 'kyPVw5LZsN1p0tWabKw27ZrwTr17ZxpGZD0YpV4aJXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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