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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06cd9da76a3636eb0f6a1db18701fe48e06c395ac16436c8c1fa4d3ec3538fb6' 
  AND token = 'PYhsLLWTM1/8XHvIPvhgvYH6vwPxGw+Z5WxsyuH9sWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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