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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fd0be270a9466f8c9b05e4d04d7f23e313994795b79927b50b7fa6e0f5f7087' 
  AND token = 'PrFnabsp95SNj9PAIi063WbxeJIX4l7aEH7GmJhLZ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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