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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0629c66a23d10670f4476c7fe5fcc472561f9acedad2c0ec435e00f34d2453c5' 
  AND token = 'RadE9ssUyo2epYUyl6fUoZFIe2Z6/uCAZPOE+5wbBek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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