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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4614e692821b1c94b3cdb371b473d06c7aba18fe6a13ddc2ae7f5857d61ff960' 
  AND token = '2+gtsIF0VWAP962112nsyboHwMuzfK7t3UzbsZvuaDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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