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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba3f60df80c7c48d2c9d211c2bee9d5a9e15e449afc853219b55ac70a5ccd7f2' 
  AND token = '0QRH1bs/e2liQt8EMXnrLsnV9203Q1xVSRQNNXi5FnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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