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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae3302cccdf2d4880aee39d7db232aa4b5e407ccea565c020a9d468f0737648' 
  AND token = 'A2+g1gcAXeL4CINaCEDe8wQMw4bE4ZRyg3k04ZevH6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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