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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afbb0a8c339bb61cd9f3a9a0eb166b8070b558dd08b5c86f97c6d1e933b96da' 
  AND token = 'LRh9WxBPKdmd2gPoFWqXN+AvHOSQtdWcRFSozfga20U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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