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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73833fd3c45670207505db2a0bba4313a55b174798d27fac62f574283c43443d' 
  AND token = 'fIf9o9k8QB4Zay+0d08H66YRClNUh9KJUrTU5u/tqbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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