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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49e0e12ad82c4e3ea3dd883914a8ba950ef07b068259b45f746ac71e54371747' 
  AND token = 'z8aXwe/jyTXllw61lTcC1eF+51J802z8V/xZrTWCvtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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