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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a22de14c966821a4bb0fc627238d35d337219828cc2abf0fc570c21e76c8ac8' 
  AND token = 'ErKlPRmC11DGsCBOXiqqYoGMrS1hplyZWecTht5E3ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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