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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f152ea95f636fc2edce78207580b4e167ec47249db36c0bb77c730fe9bd21c9f' 
  AND token = 'xFAbq2VQIyvEPTn2Vwo9m/6uEu7C/30vHYMI5MOpuVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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